<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
<script>
    function add(arr){
        return arr[0]  + arr[1] + arr[2]
    }
    let [a, b, c] = [1, 2, 3]
    console.log(add([a, b , c]))

    function add1(arr){
        let [x , y] = arr;
        return x + y;
    }
    console.log(add1([5, 6]))

    function show(student){
        console.log(student.id,student.name,student.age)
    }
    show({id:1001,name:'tom',age:18})
</script>

</body>
</html>